THE COMPARISON BETWEEN QUALITY NORMS OF THE MATERIAL OF THE TRUNG DU TEA VARIETY WHICH PROCESSED IN TAN CUONG, THAI NGUYEN AND THE OTHER WHICH IS PROCESSED IN THANH BA, PHU THO Ngô Xuân Cường Nguyễn Duy Thịnh Hà Duyên Tư PDF (Vietnamese) điểm / đánh giá Published 2011-11-25 Issue Vol. 47 No. 1 (2009) Section Articles